Gamers 4 Croydon were a political party that helped Australians turn the tide against archaic ratings laws. In appreciation for their efforts, Valve will be honouring them with a little shout-out in Left 4 Dead 2.

The zombie shooter was one of the more high profile victims of Australia's old ratings system, and had to be toned down for release here. Now that the country has an adults-only rating, however, the game is being re-released in its full, blood-splattered glory.

As a tip of the hat for their service, then, Valve has put some "Gamers 4 Croydon" graffiti in the game, Gabe Newell himself emailing the guys behind the party to let them know.